General fact: 66439 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 66439 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 66439 is an uninteresting number.
Historical date: November 25th is the day in 1992 that the Federal Assembly of Czechoslovakia votes to split the country into the Czech Republic and Slovakia from January 1, 1993.